NERVES OF SKELETAL MUSCLES 

 C. B.C. 



3*3 



P.O.. 



FIG. 206. DIAGRAM SHOWING THE RELATION OF SKELETAL, MUSCLE AND NERVE 



TISSUES (G. Bachman.) 



f.a. Bones of the forearm representing the skeletal tissue; e.j. the elbow 

 joint, the fulcrum of the lever formed by the bones of the forearm; W. a 

 weight acting in a downward direction and representing the passive force of 

 gravity; sk.m. a skeletal muscle acting in an upward direction and the source of the 

 active power to be applied to the lever; sp.c. transection of the spinal cord showing 

 the relation of the white and the gray matter; m.c. a motor cell in the anterior horn 

 of the gray matter; ef.n. an efferent nerve-fiber connecting the motor cell from which 

 it arises with the skeletal muscle and contained in the ventral roots of the spinal 

 nerves; af.n. an afferent nerve-fiber arising from the ganglion cell along its course and 

 connecting the skin, 5., on the one hand with the spinal cord on the other hand and 

 contained in the dorsal roots of the nerves; c.s.c. coronal section of the cerebrum 



